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Updated: Sep 13, 2025

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Exciton Trapping at Shape-Persistent Molecular Nanotubes.

Victor M Espinoza Castro1, Saber Mirzaei1,2, Mohammad Bilal1

  • 1Department of Chemistry, Rice University, 6100 Main St., Houston, Texas, 77005, USA.

Angewandte Chemie (International Ed. in English)
|July 31, 2025
PubMed
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This summary is machine-generated.

Researchers synthesized molecular nanotubes with varying connectivity, from meta- to para-phenylene bridges. Increasing para-phenylene content alters strain, optical properties, and exciton delocalization without changing nanotube size.

Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Shape-persistent molecular nanotubes are crucial for advanced materials.
  • Controlling nanotube structure impacts their electronic and optical properties.

Purpose of the Study:

  • To synthesize and characterize a series of molecular nanotubes with systematic variations in phenyl ring connectivity.
  • To investigate the relationship between structural changes and photophysical properties.
  • To understand exciton delocalization within these nanotubes.

Main Methods:

  • Single-crystal X-ray diffraction (SCXRD) and microcrystal electron diffraction (MicroED) for structural analysis.
  • Density functional theory (DFT) calculations to determine torsional angles and strain energy.
Keywords:
Exciton self‐trappingFluorescenceMacrocycle templateMolecular nanotubeResorcin[n]arenes

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  • UV-Vis absorption and fluorescence spectroscopy to measure optical properties.
  • Time-dependent (TD)-DFT for excited state analysis.

    • Main Results:

    • A series of shape-persistent molecular nanotubes with meta- (m4) to para- (p4) phenylene bridges were synthesized.
    • Experimental and DFT data revealed increasing torsional angles and strain energy from m4 to p4 nanotubes.
    • Optical properties shifted, including a red shift in absorption (330 to 394 nm) and emission (444 to 546 nm), with decreased fluorescence quantum yield (0.76 to 0.20).
    • TD-DFT indicated progressive exciton delocalization with increasing para-phenylene content, correlating with enhanced π-conjugation.

    Conclusions:

    • Systematic variation of phenylene connectivity in molecular nanotubes allows fine-tuning of their photophysical properties.
    • Increased π-conjugation due to para-phenylene incorporation drives exciton delocalization.
    • Exciton trapping can occur without altering the nanotube's physical dimensions, offering a novel design strategy for optoelectronic materials.